.classintro {
	// 视频播放盒子
	.videobox {
		position: relative;
		video {
			width: 100%;
		}
		span {
			font-family: "宋体";
			font-size: 20px;
			position: absolute;
			left: 20px;
			top: 20px;
			color: #fff;
			font-weight: bold;
		}
		// 播放按钮
		.playbtn {
			position: absolute;
			top: 50%;
			left: 50%;
			color: #fff;
			transform: translate(-50%, -50%);
			text-align: center;
			.icon-continue {
				font-size: 40px;
				display: block;
				margin-bottom: 5px;
			}
		}
		.pausebtn {
			display: none;
			position: absolute;
			top: 50%;
			left: 50%;
			color: #fff;
			transform: translate(-50%, -50%);
			text-align: center;
			.icon-continue {
				font-size: 40px;
				display: block;
				margin-bottom: 5px;
			}
		}
	}
	// 主体内容
	main {
		padding: 20px;
		// 视频介绍
		.title {
			border-bottom: 2px solid #ccc;
			margin-bottom: 20px;

			h2 {
				margin-bottom: 10px;
			}
			#titData {
				display: flex;
				justify-content: space-between;
				color: #888;
				line-height: 40px;
				.num1 {
					font-size: 25px;
					color: #000;
				}
				.num2 {
					font-size: 25px;
					color: #000;
				}
				.second-data {
					flex-grow: 0.5;
				}
				.symbol {
					font-family: "宋体";
					margin-left: 10px;
					font-weight: bold;
				}
			}
		}
		// 课程介绍
		.content {
			margin: 20px 0;
			.author {
				display: flex;
				justify-content: space-between;
				align-items: center;
				img {
					width: 100px;
					height: 100px;
					border-radius: 50%;
				}
				// 作者名字
				.author-name {
					flex-grow: 0.6;
					#name {
						display: block;
						margin-bottom: 5px;
					}
					#sign {
						font-size: 14px;
						color: #555;
					}
				}
				// 关注按钮
				#attBtn {
					width: 80px;
					height: 30px;
					background-color: #4294ff;
					color: #fff;
					padding: 5px;
					border-radius: 15px;
				}
			}
			.wrap {
				position: relative;
				#state {
					position: absolute;
					left: -9999px;
					&:checked ~ p {
						-webkit-line-clamp: 9999;
					}
					&:checked + .textbtn::after {
						content: "收起";
					}
				}
				.textbtn {
					position: absolute;
					bottom: 0;
					right: 10px;
					background-color: #fff;
					&::after {
						content: "...更多";
					}
				}

				.text {
					margin: 10px 0;
					font-size: 14px;
					line-height: 20px;
					color: #998;
					overflow: hidden;
					display: -webkit-box;
					-webkit-line-clamp: 2;
					-webkit-box-orient: vertical;
				}
			}
		}
		// 练习数据
		.pradata {
			margin: 10px 0;
			display: flex;
			justify-content: space-between;
			// 练习频次
			.data1 {
				display: flex;
				justify-content: flex-start;
				.icon-data {
					font-size: 30px;
					color: #647;
				}
				h4 {
					margin-left: 5px;
					span {
						display: block;
						color: #ccc;
						font-size: 14px;
						margin-top: 10px;
					}
				}
			}
			// 器械
			.data2 {
				box-sizing: border-box;
				padding: 0 80px 0 20px;
				border-left: 1px dashed #5e5d5d;
				h4 {
					margin-bottom: 5px;
					i {
						margin-right: 5px;
					}
				}
				p {
					color: #888;
				}
			}
		}
	}
	// 开始训练按钮
	footer {
		#startBtn {
			display: block;
			margin-left: 20px;
			width: 90%;
			background-color: #4294ff;
			border-radius: 25px;
			height: 50px;
			color: #fff;
			text-align: center;
			line-height: 50px;
		}
	}
}
